Question

I’ve been stuck with this problem from a couple of days and I can’t get myself out of it.
I’ve searched all over the net, but I couldn’t find anything useful to solve my issue.

this is the scenario.

I’ve got an array of strings containing a bunch of ids fetched from a coredata sqlite db and
I’d like to know the index of a certain element into this array.

My first solution would have been as easy as using indexOfObject

-(NSInteger) getPageId:(NSString *)symbol_id {
    NSInteger refId = [myIds indexOfObject:symbol_id];
    // .. stuff ..
    return refId;
}

now, I don’t know why, but the returning value of the function is always NSNotFound.
If I print out the values via NSLog

NSLog(@"%@\n%@", myIds, symbol_id);

I can clearly see that the value I’m searching for figures out into the elements of the array.

I’ve even tried a dumbest solution, like probing the match via isEqual function into a for loop:

int idx = 0;
for(NSString *tok in myIds) {
   if([tok isEqual:synmbol_id])
   {
     NSLog(@"yay, a match was encountered!!");
     return idx;
   }
   idx++;
}

but the execution never gets into the NSLog.

I dunno where to knock my head.

hope that some of you already figured this out and could explain this to me.

thx in advance

k

Answer 1

Try printing all the elements on the array like this:

for(NSString *tok in myIds) {
   NSLog(@"On the array [%@]", tok);
}

Maybe there is a TAB \t, an ENTER \n or something weird in your NSString preventing isEqual message to run as expected. Usually these characters are hard to find on a regular debugger. That’s why I’am suggesting to enclose the string in [].